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Data Type NUMBER length 38 Or 22....???

Hi,

We are using Oracle 8.1.6 on Windows 2000. Recently I came across Data type NUMBER difference. In User_Tab_Columns If data type is NUMBER it shows data length 22, Data Precision Null and Data Scale 0. Where as some places it shows data length 22, Data Precision 38 and Data Scale 0. Which is correct behavior?